now the united states is monitoring the situation. >>> there are reports connecting the attack in libya to al-qaeda. there's a growing controversy about why american diplomats were not protected better. allison? >> reporter: u.s. officials say their investigation is evolving and they're learning more every day about who was behind that attack on the u.s. consulate in libya that killed four diplomats, including the u.s. am am. >> u.s -- intelligent officials believe the weapons were provided and most of the fighters. top officials say there was some intelligence ahead of the attack about terror groups in benghazi. >> there was nothing specific and certainly not a specific threat to the consulate that i'm aware of. >> now the obama administration is under fierce criticism from republicans for not doing more to protect u.s. diplomats in libya and how it's managed this crisis. i will have more on that during my next update. allison burns, ktvu news. >>> following up on a tip of the death of jimmy hoffa almost 40 years ago. today police will take soil samples. a man dying of cancer told poli